Product Overview
The GR Series Three-Screw Pumps are the core product of the SETTIMA SMT16B series. Founded in 1978, Settima Meccanica initially focused on producing high-technology three-screw pumps for the elevator industry to reduce noise and vibration in hydraulic circuits. Over more than four decades, Settima has become a globally recognized manufacturer of low-noise screw pumps, with over 1,000,000 pumps installed worldwide.
The SMT16B series is an industrial low-pressure three-screw pump range (continuous pressure up to 40 bar, peak 50 bar). Developed based on the mass production experience of elevator pumps, it is a reliable and low-noise industrial solution. SMT16B pumps are oil-filled pumps assembled in a pump body, with the pump body and screw design eliminating any axial loads. Compared to standard SMT pumps, SMT16B features shorter screws, making it ideal for space-restricted applications.
GR series three-screw pumps are positive displacement rotary pumps with axial flow design and only three moving parts—one driving screw and two driven screws. The idler screws act as sealing elements and are hydraulically rotated by the pumped fluid. There is only a rolling action between the driving screw and idler screws, which eliminates noise and vibration.
GR25-SMT16B-25L-RF2 model code breakdown:
GR25: GR series, size group 25
SMT16B: SMT16B series – dry-installation industrial pump with shorter screws for space-restricted applications
25L: Nominal flow of 25 L/min @ 3000 rpm
RF2: Configuration code (seal and interface configuration)
GR40-SMT16B-100L model code breakdown:
We specialize in the R&D and manufacturing of high-pressure pumps, motors, and valve groups. All GR series SMT16B models offer 100% direct interchangeability with original Settima pumps of the same model—no modification required. Every unit undergoes 100% simulated load testing before shipment, ensuring performance validation under real-world operating conditions.
Technical Specifications
SMT16B Series General Specifications:
Brand Series: SETTIMA GR Series / SMT16B Series
Pump Type: Three-screw pump
Mounting Type: Dry installation (SMT) / Submersible optional
Continuous Operating Pressure: 40 bar
Peak Pressure: 50 bar
Pressure Version: Low-pressure version (40/50 bar)
Fluid Media: Mineral hydraulic oil, lubricating oils, various industrial fluids
Viscosity Range: Up to 1000 cSt
Temperature Range: -25°C to +150°C
Noise Level: Extremely low noise operation
Rotation Direction: Clockwise viewed from shaft end (standard)
Speed Range: 500 to 3600 rpm
Mounting Flange: ISO 3019/2 compliant
Line Connections: SAE 3000 PSI and BSP threads
Installation Position: Any orientation
Safety Valve Options: Internal or external relief valves
GR25-SMT16B-25L-RF2 (GR25SMT16B25LRF) Specifications:
Model: GR25-SMT16B-25L-RF2
Size Group: GR25
Nominal Flow (@ 3000 rpm): 25 L/min
Flow @ 3000 rpm: 19 L/min (external configuration)
Flow @ 1500 rpm: 80 L/min
Continuous Operating Pressure: 40 bar
Peak Pressure: 50 bar
Flange Specification: 25 L/3000 rpm
Shaft: ISO 3019/2 compliant
Rotation Direction: Clockwise
Mounting: Submersible
Port Connection: BSPP threads (GAS)
Check Valve: 10 bar
Country of Origin: Italy
GR40-SMT16B-100L Specifications:
Model: GR40-SMT16B-100L
Size Group: GR40
Nominal Flow (@ 3000 rpm): 100 L/min
Continuous Operating Pressure: 40 bar
Peak Pressure: 50 bar
Mounting Type: Dry installation (SMT)
Application Feature: Ideal for space-restricted applications
Note: “25L” on GR25 and “100L” on GR40 both indicate nominal flow (L/min) at 3000 rpm. Different configuration codes (RF2, RF1, etc.) correspond to different seal materials, shaft types, and interface configurations. Refer to the pump nameplate for exact specifications.
Key Technical Advantages
1. Ultra-Low Noise & Pulse-Free Operation via Three-Screw Principle
Settima three-screw pumps utilize three specially profiled helical screws (one driving screw + two driven screws) that mesh to create continuous, pulse-free media delivery. There is only a rolling action between the driving screw and idler screws, which eliminates noise and vibration. Settima is a globally recognized manufacturer of low-noise screw pumps, having achieved revolutionary innovation in pump noise control.
2. Extremely Low Pressure Pulsation – Ensures Smooth System Operation
The special helical screw design ensures continuous fluid delivery with minimal pressure pulsation. Settima screw pumps are renowned for being pulse-free and noise-free. The advanced design and high-precision machining of the screws ensure very low acoustic emission and pulsation levels. The geometry and high-precision machining of the three screws form sealed chambers that smoothly transport fluid axially from inlet to outlet.
3. Exceptional Reliability with Minimal Maintenance Requirements
Three-screw pumps have very few moving parts—only three screws—significantly reducing the probability of mechanical failure. The pump body and screw design eliminate any axial loads. Operating pressure creates clearances between the balancing piston of the main screw and the surrounding body, producing balanced hydrodynamic forces that simultaneously lubricate and cool sealing components. The torque required to rotate the side screws is transmitted hydraulically by the pumped fluid, meaning the screws experience no mechanical wear during rotation.
4. Broad Media Compatibility with Installation Flexibility
The SMT16B series can handle media ranging from mineral hydraulic oils to high-viscosity lubricating oils, with viscosity up to 1000 cSt and temperature range from -25°C to +150°C. Pumps can be installed in any orientation (dry or submersible). ISO 3019/2 standard flanges and SAE/BSP port options ensure compatibility with a wide range of industrial equipment.
5. Compact Design – Ideal for Space-Restricted Applications
Compared to standard SMT pumps, SMT16B features shorter screws, specifically designed for space-restricted applications. The compact design allows easy installation in the limited space of various industrial equipment.
6. Excellent Self-Priming Capability with Wide Viscosity Adaptability
The three-screw pump design provides excellent self-priming capability. Speed range covers 500 to 3600 rpm, flexibly适配 various drive motors. SMT16B pumps are reliable and noise-free solutions for industrial applications requiring long service life and very smooth fluid flow.
Application Areas
Lube Oil Stations—centralized lubrication and cooling for industrial equipment
Gearbox Lubrication Systems—forced lubrication for various industrial gearboxes
Turbine Lubrication Systems—bearing lubrication for steam and gas turbines
Compressors & Rotating Equipment—lubrication and cooling systems
Elevators & Lifts—hydraulic systems (Settima’s founding application)
Paper Machinery—bearing lubrication for calenders and dryer cylinders
Mining Machinery—low-pressure hydraulic and lubrication systems
Machine Tools—hydraulic and lubrication systems
Injection Molding—hydraulic systems
Oil & Gas—industrial pumping applications
Power Generation—lubrication systems for various power generation equipment
Expert Maintenance Tips
Model Code Verification (verify each element):
SMT16B series model codes contain critical information. Before selection and installation, confirm the following:
GR: Product series identifier.
Numbers (20/25/32/40/45/55/60/70/80/90/110, etc.) : Size group.
SMT16B: SMT16B series – dry-installation industrial pump with shorter screws for space-restricted applications.
Flow code (e.g., 25L, 100L, 150L, etc.) : Nominal flow (L/min @ 3000 rpm).
AC code (e.g., AC19, AC28, etc.) : Flange type and motor mounting specification.
B5 / B14: Flange mounting type.
RF1 / RF2 / RF3: Configuration version code – seal material and interface configuration.
Verify Rotation Direction:
Standard GR series rotates clockwise when viewed from the shaft end. Before installation, confirm that the drive motor rotation matches the pump’s rotation requirement. Counter-clockwise rotation must be specified at the time of ordering. Incorrect rotation will prevent the pump from delivering media properly.
Suction Line and Inlet Pressure Requirements:
GR series screw pumps offer excellent self-priming capability. Ensure the suction line is properly sealed with no air leaks, and select suction line diameter appropriately based on flow rate to avoid cavitation. SMT16B pumps can be installed completely or partially submerged in oil.
Coupling Alignment and Installation Precautions:
Ensure that no axial or radial shaft loads are transmitted to the pump during installation. Use flexible couplings with concentricity within 0.05 mm. Mounting flanges conform to ISO 3019/2 standard. For B5 or B14 flange versions, pumps can be mounted directly onto compatible IEC/DIN motors.
First-Start Priming Procedure:
After new pump installation or system overhaul, ensure the pump cavity is filled with media before first start. Jog the pump at low speed until the pump body is fully filled with oil and air is purged, then gradually increase to rated speed. Three-screw pumps must never be operated dry—running without media will cause severe wear to screws and the pump housing.
Filtration System and Oil Cleanliness Management:
Regularly inspect return filter condition and replace hydraulic oil and filters per equipment manufacturer recommended intervals. SMT16B pumps can be equipped with internal or external safety relief valves. Proper oil cleanliness management significantly extends pump service life.
Temperature and Viscosity Monitoring:
Maintain media temperature within -25°C to +150°C range. Excessive viscosity increases suction resistance, while low viscosity may reduce volumetric efficiency and increase internal leakage. Regularly inspect oil condition and replace if emulsified, degraded, or contaminated beyond acceptable limits.
